ALA-A2, a cancer peptide found in α-lactalbumin, selectively kills cancer cells by inducing autophagy (Autophagy). It possesses cell-penetrating properties, allowing it to enter cells effectively without relying on membrane solubilization effects. In A549 lung cancer cells, ALA-A2 demonstrates significant dose-dependent anticancer activity. This peptide shows promise for research in cancer treatment and autophagy regulation.